Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-12-27
1996-06-11
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 61, 525386, 525408, 525437, 527300, 528354, C08G 6391, C08G 6378
Patent
active
055256716
ABSTRACT:
A process for continuously producing a linear lactide copolymer having a weight-average molecular weight of from 20,000 to 400,000 using a continuous reaction apparatus composed of three or more stirred flow reactors connected in series, which process comprises the steps of continuously feeding from 50 to 98 parts by weight of a lactide and from 2 to 50 parts by weight of a polymer having a hydroxyl group in a molten state or as dissolved in a solvent to the first reactor of said continuous reaction apparatus, and transferring the reaction mixture from said first reactor to the following reactors successively while maintaining the reaction pressure and the reaction temperature in every reactor in the range of from 1 to 5 atm. and of from 140.degree. to 210.degree. C., respectively, to conduct ring opening copolymerization. According to the process of the present invention, the production problems associated with conventional continuous production methods for lactide copolymers, i.e., high viscosity of the reaction system, thermal decomposition of the polymer produced, and coloration of the polymer produced can be eliminated, and a degradable lactide copolymer endowed with broader range properties than conventional lactide copolymers and therefore useful in wider fields can be obtained continuously and efficiently.
REFERENCES:
patent: 5136017 (1992-08-01), Kharas
patent: 5202413 (1993-04-01), Spinu
patent: 5403897 (1995-04-01), Ebato
Ebato Hiroshi
Imamura Shoji
Dainippon Ink and Chemicals Inc.
Short Patricia A.
LandOfFree
Continuous production process for lactide copolymer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous production process for lactide copolymer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous production process for lactide copolymer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-352231